Make ada_lookup_encoded_symbol "return" a struct ada_symbol_info

This makes ada_lookup_encoded_symbol more consistent with other functions
such as ada_lookup_symbol_list, and also makes it clearer in the code
using that function that symbol and block are related.

gdb/ChangeLog:

        * ada-lang.c (ada_lookup_encoded_symbol): Now returns void.
        Replace block_found argument by symbol_info.  Adjust
        implementation accordingly.  Add function documentation.
        (ada_lookup_symbol): Adjust to new ada_lookup_encoded_symbol.
        Fix documentation.
        * ada-lang.h (ada_lookup_encoded_symbol): Update declaration.
        * ada-exp.y (write_object_renaming): Adjust to new
        ada_lookup_encoded_symbol API.

gdb/ChangeLog

@@ -1,3 +1,14 @@
+2012-03-29  Joel Brobecker  <brobecker@adacore.com>
+
+	* ada-lang.c (ada_lookup_encoded_symbol): Now returns void.
+	Replace block_found argument by symbol_info.  Adjust
+	implementation accordingly.  Add function documentation.
+	(ada_lookup_symbol): Adjust to new ada_lookup_encoded_symbol.
+	Fix documentation.
+	* ada-lang.h (ada_lookup_encoded_symbol): Update declaration.
+	* ada-exp.y (write_object_renaming): Adjust to new
+	ada_lookup_encoded_symbol API.
+
 2012-03-29  Joel Brobecker  <brobecker@adacore.com>
 
 	* ada-lang.h (struct ada_symbol_info): Reformat.  Improve

gdb/ada-exp.y

@@ -867,8 +867,7 @@ write_object_renaming (struct block *orig_left_context,
 {
   char *name;
   enum { SIMPLE_INDEX, LOWER_BOUND, UPPER_BOUND } slice_state;
-  struct symbol *sym;
-  struct block *block;
+  struct ada_symbol_info sym_info;
 
   if (max_depth <= 0)
     error (_("Could not find renamed symbol"));
@@ -877,29 +876,28 @@ write_object_renaming (struct block *orig_left_context,
     orig_left_context = get_selected_block (NULL);
 
   name = obsavestring (renamed_entity, renamed_entity_len, &temp_parse_space);
-  sym = ada_lookup_encoded_symbol (name, orig_left_context, VAR_DOMAIN, 
-				   &block);
-  if (sym == NULL)
+  ada_lookup_encoded_symbol (name, orig_left_context, VAR_DOMAIN, &sym_info);
+  if (sym_info.sym == NULL)
     error (_("Could not find renamed variable: %s"), ada_decode (name));
-  else if (SYMBOL_CLASS (sym) == LOC_TYPEDEF)
+  else if (SYMBOL_CLASS (sym_info.sym) == LOC_TYPEDEF)
     /* We have a renaming of an old-style renaming symbol.  Don't
        trust the block information.  */
-    block = orig_left_context;
+    sym_info.block = orig_left_context;
 
   {
     const char *inner_renamed_entity;
     int inner_renamed_entity_len;
     const char *inner_renaming_expr;
 
-    switch (ada_parse_renaming (sym, &inner_renamed_entity, 
+    switch (ada_parse_renaming (sym_info.sym, &inner_renamed_entity,
 				&inner_renamed_entity_len,
 				&inner_renaming_expr))
       {
       case ADA_NOT_RENAMING:
-	write_var_from_sym (orig_left_context, block, sym);
+	write_var_from_sym (orig_left_context, sym_info.block, sym_info.sym);
 	break;
       case ADA_OBJECT_RENAMING:
-	write_object_renaming (block,
+	write_object_renaming (sym_info.block,
 			       inner_renamed_entity, inner_renamed_entity_len,
 			       inner_renaming_expr, max_depth - 1);
 	break;
@@ -939,7 +937,7 @@ write_object_renaming (struct block *orig_left_context,
 	  {
 	    const char *end;
 	    char *index_name;
-	    struct symbol *index_sym;
+	    struct ada_symbol_info index_sym_info;
 
 	    end = strchr (renaming_expr, 'X');
 	    if (end == NULL)
@@ -950,14 +948,15 @@ write_object_renaming (struct block *orig_left_context,
 			    &temp_parse_space);
 	    renaming_expr = end;
 
-	    index_sym = ada_lookup_encoded_symbol (index_name, NULL,
-						   VAR_DOMAIN, &block);
-	    if (index_sym == NULL)
+	    ada_lookup_encoded_symbol (index_name, NULL, VAR_DOMAIN,
+				       &index_sym_info);
+	    if (index_sym_info.sym == NULL)
 	      error (_("Could not find %s"), index_name);
-	    else if (SYMBOL_CLASS (index_sym) == LOC_TYPEDEF)
+	    else if (SYMBOL_CLASS (index_sym_info.sym) == LOC_TYPEDEF)
 	      /* Index is an old-style renaming symbol.  */
-	      block = orig_left_context;
-	    write_var_from_sym (NULL, block, index_sym);
+	      index_sym_info.block = orig_left_context;
+	    write_var_from_sym (NULL, index_sym_info.block,
+				index_sym_info.sym);
 	  }
 	if (slice_state == SIMPLE_INDEX)
 	  {

gdb/ada-lang.c

@@ -5191,42 +5191,52 @@ ada_iterate_over_symbols (const struct block *block,
     }
 }
 
-struct symbol *
-ada_lookup_encoded_symbol (const char *name, const struct block *block0,
-			   domain_enum namespace, struct block **block_found)
+/* The result is as for ada_lookup_symbol_list with FULL_SEARCH set
+   to 1, but choosing the first symbol found if there are multiple
+   choices.
+
+   The result is stored in *SYMBOL_INFO, which must be non-NULL.
+   If no match is found, SYMBOL_INFO->SYM is set to NULL.  */
+
+void
+ada_lookup_encoded_symbol (const char *name, const struct block *block,
+			   domain_enum namespace,
+			   struct ada_symbol_info *symbol_info)
 {
   struct ada_symbol_info *candidates;
   int n_candidates;
 
-  n_candidates = ada_lookup_symbol_list (name, block0, namespace, &candidates,
+  gdb_assert (symbol_info != NULL);
+  memset (symbol_info, 0, sizeof (struct ada_symbol_info));
+
+  n_candidates = ada_lookup_symbol_list (name, block, namespace, &candidates,
 					 1);
 
   if (n_candidates == 0)
-    return NULL;
+    return;
 
-  if (block_found != NULL)
-    *block_found = candidates[0].block;
-
-  return fixup_symbol_section (candidates[0].sym, NULL);
-}  
+  *symbol_info = candidates[0];
+  symbol_info->sym = fixup_symbol_section (symbol_info->sym, NULL);
+}
 
 /* Return a symbol in DOMAIN matching NAME, in BLOCK0 and enclosing
    scope and in global scopes, or NULL if none.  NAME is folded and
    encoded first.  Otherwise, the result is as for ada_lookup_symbol_list,
    choosing the first symbol if there are multiple choices.
-   *IS_A_FIELD_OF_THIS is set to 0 and *SYMTAB is set to the symbol
-   table in which the symbol was found (in both cases, these
-   assignments occur only if the pointers are non-null).  */
+   If IS_A_FIELD_OF_THIS is not NULL, it is set to zero.  */
+
 struct symbol *
 ada_lookup_symbol (const char *name, const struct block *block0,
                    domain_enum namespace, int *is_a_field_of_this)
 {
+  struct ada_symbol_info symbol_info;
+
   if (is_a_field_of_this != NULL)
     *is_a_field_of_this = 0;
 
-  return
-    ada_lookup_encoded_symbol (ada_encode (ada_fold_name (name)),
-			       block0, namespace, NULL);
+  ada_lookup_encoded_symbol (ada_encode (ada_fold_name (name)),
+			     block0, namespace, &symbol_info);
+  return symbol_info.sym;
 }
 
 static struct symbol *

gdb/ada-lang.h

@@ -235,9 +235,9 @@ extern char *ada_fold_name (const char *);
 extern struct symbol *ada_lookup_symbol (const char *, const struct block *,
                                          domain_enum, int *);
 
-extern struct symbol *
-ada_lookup_encoded_symbol (const char *, const struct block *,
-			   domain_enum namespace, struct block **);
+extern void ada_lookup_encoded_symbol
+  (const char *name, const struct block *block, domain_enum namespace,
+   struct ada_symbol_info *symbol_info);
 
 extern struct minimal_symbol *ada_lookup_simple_minsym (const char *);